chern wrote:
Hi all,
Is it possible to separately adjust the levels of positive and
negative electron density?
No (and yes).
When I try to build a fragment with a poor density I want to decrease
the level of positive density from 3 sigma to 2 or even 1 sigma to see
more positive density, but then the whole map becomes red with
negative density.
That is supposed to indicate something to you.
Can I shut off the negative density at all, leaving only the positive
density in the PHFOFCWT maps?
Yes - sort of. When you read in the mtz file, uncheck the "is difference
map?" check box, then you will not get a negative level. You will have
to colour the new map "by hand" though.
( I would like also to color them separately). It is possible to do so
in xtalview.
As above - if you want scroll negative levels then you will need to do
something like:
(set-stop-scroll-diff-map-level -5)
Paul.
